immobile DNA junction
A branched double-stranded DNA structure, a chi-form in which each of four polynucleotide chains is complementary to and base-paired with the 3'-end of one polynucleotide and the 5'-end of another; unlike in a recombination intermediate, the junction cannot migrate (i.e. slide its branch point along the duplex) without breaking many more Watson-Crick base-pair hydrogen bonds as it advances than can re-form behind it. (see also Holliday model)
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